Palette Tab
The Palette
tab (pictured below) is available for raster image files that use a fixed
color palette for display. This tab allows the user to see what colors
are in the palette as well as edit the color and/or description of each
color in the palette. This allows for easy replacement of one color with
another.
Users can also save the palette to a new file, to share with other users, or load an entirely new palette to use for the layer from an existing .PAL or .CLR file.
To edit the Palette Index values see Raster Reclassify